timing & charge yield of surface and bulk event
DESCRIPTION
Timing & charge yield of Surface and Bulk event. EDEWEISS. Liquid scintillation detector. Large mass More information. XENON :液态氙实验的屏蔽和宇宙线反符合. 5cm 高纯无氧铜. 20cm 铅. 20cm 聚乙烯. Ionization and Scintillation of Xenon. Transparence layer. Signals from XENON10. LXe 内部放射性. LAr 内部放射性. - PowerPoint PPT PresentationTRANSCRIPT
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Timing & charge yield of Surface and Bulk event
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EDEWEISS
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Liquid scintillation detector
Large massMore information
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20cm 聚乙烯
20cm 铅
5cm 高纯无氧铜
XENON :液态氙实验的屏蔽和宇宙线反符合
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Ionization and Scintillation of Xenon
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Transparence
layer
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Signals from XENON10
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LXe 内部放射性
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LAr 内部放射性
衰变方式 放射性核素 含量222Rn
T1/2 = 3.8 d , , 原生 238U 1 - ?00 Bq/m3 air
85Kr T1/2 = 10.8 y (687 keV) , 235U 裂变 1.4 Bq/m3 air
39Ar T1/2 = 269 y (565 keV) 宇生放射性 1.8 Bq/m3 Ar
42Ar T1/2 = 32.9 y (600 keV) 宇生放射性 50 µBq/m3 Ar
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相对闪烁荧光效率和抑制因子
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小结• 目前的探测器技术在高质量区域的测量比较可靠,也
可信,高质量区域测量的问题较多。
• 在低质量区的问题:电子学噪声,探测器自身本底,抑制因子, DSP 技术
• 降低测量阈值不仅有利低质量的探测,也有利于高质量的探测。
• 两个发展方向: 低阈,低本底,
• 我国的 CJPL 为 DM 的研究提供了很好条件,望理论和实验加强合作
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Thanks